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OpenCloudOS-Kernel
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regmap: Bypass the cache when applying patches 

Otherwise any patch that affects a register which is writable may trash
cached values.

Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
This commit is contained in:
Mark Brown 2012-01-25 21:05:48 +00:00
parent d9db762708
commit 8a892d6996
1 changed files with 2 additions and 0 deletions
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2
drivers/base/regmap/regcache.c
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@ -273,6 +273,7 @@ int regcache_sync(struct regmap *map)
goto out;
/* Apply any patch first */
map->cache_bypass = 1;
for (i = 0; i < map->patch_regs; i++) {
ret = _regmap_write(map, map->patch[i].reg, map->patch[i].def);
if (ret != 0) {
@ -281,6 +282,7 @@ int regcache_sync(struct regmap *map)
goto out;
}
}
map->cache_bypass = 0;
if (map->cache_ops->sync) {
ret = map->cache_ops->sync(map);